I feel that it completely misses the point of a blockchain in the first place. In a free market, where supply and demand alter according to people's needs, there can be value stable only if there exists a group of people with the ability to change the supply, to fix the equilibrium point. That's the complete opposite of decentralization.

This is so wrong. Bitcoin comes with smart contracts since 2009, there have been non-monetary transactions made since the very early days, the developers have no such power whatsoever, and there is nothing they can do even if they couldn't unless Bitcoin stopped being resilient to censorship.